He's already basically said all that in response to the deluge of criticism around the Anniversary.

This will be one of those things fans will debate over the next 50 years. I really want him to come out and say "the show wanted to go in to lonely god loves his 20 year old companions and that skeeved me out."

Also, a return to Gallifrey is confirmed in the finale. Looks like the finale will pick up where Day of the Doctor ended, from Capaldi's POV. Which either means the Time Lords will get to come back then, or the quest for them will simply begin in the cliffhanger. Probably the latter so they can milk that shit through the 20-teens.